If `f:R to R and g:R to R` are defined by `f(x)=(2x+3) and g(x)=x^(2)+7`, then the values of x

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If `f:R to R and g:R to R` are defined by `f(x)=(2x+3) and g(x)=x^(2)+7`, then the values of x such that g(f(x))=8 are
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